Труды сотрудников института физики

/ E.M. Aver'yanov // Russ. J. Phys. Chem. A. - 2012. - Vol. 86, Is. 5. - P. 720-728, DOI 10.1134/S0036024412050044. - Cited References: 37 . - ISSN 0036-0244РУБ Chemistry, Physical + Anisotropy + Molecules + Phase transitions + Tensors

Аннотация: Experimental values of the mean polarizability of molecules, (gamma) over bar, and components of the Lorentz tensor, L-j, in the nematic and smectic A phases are obtained for a homologous series of n-alkyl-p-(4-ethoxybenzylideneamino)-alpha-methylcinnamates. Dependences of the (gamma) over bar and L-j values on the mesophase temperature, the orientational order parameter S of molecules, and the number n in the homologous series are revealed. The quadratic dependence of (gamma) over bar (S) in the nematic and smectic phases is established that is invariant with respect to the nematic-smectic A transition. Polarizability densities of the molecular core and the alkyl chain are found from the monotone decreasing dependence (gamma) over bar (n)/v (where v is volume per one molecule) in the smectic phase. The presence (or absence) of the odd-even alternation of L-j(n) in the nematic (smectic) phase is shown. A monotone decrease in the Lorentz tensor anisotropy L with an increase in n is revealed in the smectic phase, and limiting values L-j(n -> infinity) are determined.

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Доп.точки доступа:
Аверьянов, Евгений Михайлович

/ A. P. Safronov [et al.] // AIP Adv. - 2013. - Vol. 3, Is. 5. - Ст. 052135. - P. , DOI 10.1063/1.4808368. - Cited References: 47. - This work was supported by the RFBR 10-02-96015 and 12-02-31385 projects, UrFU 215, Spanish MEC MAT2011-27573-C04 grants, Universidad del Pais Vasco UPV/EHU under UFI11/53 action and Physics Department of the University of Maryland visiting grant. Selected measurements were performed at SGIker service of UPV-EHU. We thank O.M. Samatov, Dr. A.M. Murzakayev, Dr. I. Orue, and A.A. Svalova for special support. . - ISSN 2158-3226РУБ Nanoscience & Nanotechnology + Materials Science, Multidisciplinary + Physics, Applied

Аннотация: Magnetic nanoparticles of iron oxide (MNPs) were prepared by the laser target evaporation technique (LTE). The main focus was on the fabrication of de-aggregated spherical maghemite MNPs with a narrow size distribution and enhanced effective magnetization. X-ray diffraction, transmission electron microscopy, magnetization and microwave absorption measurements were comparatively analyzed. The shape of the MNPs (mean diameter of 9 nm) was very close to being spherical. The lattice constant of the crystalline phase was substantially smaller than that of stoichiometric magnetite but larger than the lattice constant of maghemite. High value of M-s up to 300 K was established. The 300 K ferromagnetic resonance signal is a single line located at a field expected from spherical magnetic particles with negligible magnetic anisotropy. The maximum obtained concentration of water based ferrofluid was as high as 10g/l of magnetic material. In order to understand the temperature and field dependence of MNPs magnetization, we invoke the core-shell model. The nanoparticles is said to have a ferrimagnetic core (roughly 70 percent of the caliper size) while the shell consists of surface layers in which the spins are frozen having no long range magnetic order. The core-shell interactions were estimated in frame of random anisotropy model. The obtained assembly of de-aggregated nanoparticles is an example of magnetic nanofluid stable under ambient conditions even without an electrostatic stabilizer. (C) 2013 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.

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Держатели документа:
RAS, Inst Electrophys, Ekaterinburg 620016, Russia
Urals Fed Univ, Ekaterinburg 620000, Russia
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Univ Basque Country UPV EHU, Dept Elect & Elect, Bilbao 48080, Spain
Univ Basque Country UPV EHU, SGIker, Bilbao 48080, Spain
Univ Maryland, Dept Phys, FMR Grp, College Pk, MD 20742 USA

Доп.точки доступа:
Safronov, A. P.; Beketov, I. V.; Komogortsev, S. V.; Комогорцев, Сергей Викторович; Kurlyandskaya, G. V.; Medvedev, A. I.; Leiman, D. V.; Larranaga, A.; Bhagat, S. M.

/ V. V. Atuchin [et al.] // Ceram. Int. - 2012. - Vol. 38, Is. 3. - P. 2455-2459, DOI 10.1016/j.ceramint.2011.11.013. - Cited References: 23. - This study was partly supported by RFBR (Grant 09-02-00062) and SB RAS (Grant 34). . - ISSN 0272-8842РУБ Materials Science, Ceramics

Аннотация: High-temperature G0 polymorph of Rb2KMoO3F3 has been prepared by melt solidification. Micromorphology and chemical properties of the final product were evaluated by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The elpasolite-related crystal structure of G0-Rb2KMoO3F3 has been refined by Rietveld method at T = 298 K (space group Fm-3m, a = 8.92446(8) Å, V = 710.76(1) Å3; RB = 3.55%). Ferroelectric G1-Rb2KMoO3F3 polymorph, earlier reported at T˂328 K, is not found at T = 298 K.

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Держатели документа:
[Atuchin, V. V.] SB RAS, Inst Semicond Phys, Lab Opt Mat & Struct, Novosibirsk 630090 90, Russia
[Gavrilova, T. A.] SB RAS, Inst Semicond Phys, Lab Nanolithog & Nanodiagnost, Novosibirsk 630090 90, Russia
[Isaenko, L. I.
Zhurkov, S. A.] SB RAS, Inst Geol & Mineral, Lab Crystal Growth, Novosibirsk 530090 90, Russia
[Kesler, V. G.] SB RAS, Inst Semicond Phys, Lab Phys Principles Integrated Microelect, Novosibirsk 630090 90, Russia
[Molokeev, M. S.] SB RAS, Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036 36, Russia

Доп.точки доступа:
Atuchin, V. V.; Gavrilova, T. A.; Isaenko, L. I.; Kesler, V. G.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Zhurkov, S. A.

/ V. M. Denisov [et al.] // Inorg. Mater. - 2013. - Vol. 49, Is. 12. - P. 1227-1228, DOI 10.1134/S0020168513120042. - Cited References: 10 . - ISSN 0020-1685РУБ Materials Science, Multidisciplinary

Аннотация: The heat capacity of multiferroic GaFeO3 has been measured in a wide temperature range and the results have been used to evaluate its thermodynamic functions (enthalpy increment and entropy change).

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Держатели документа:
Siberian Fed Univ, Inst Nonferrous Met & Mat Sci, Krasnoyarsk 660041, Russia
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660074, Russia

Доп.точки доступа:
Denisov, V. M.; Irtyugo, L. A.; Denisova, L. T.; Patrin, G. S.; Патрин, Геннадий Семёнович; Volkov, N. V.; Волков, Никита Валентинович

/ M. Y. Kagan, V. V. Val'kov // J. Supercond. Nov. Magn. - 2012. - Vol. 25, Is. 5. - P. 1379-1382, DOI 10.1007/s10948-012-1523-3. - Cited References: 28. - We are grateful to P. Fulde, Yu. Kagan, K. I. Kugel, N.V. Prokof'ev, P. Nozieres, and C. M. Varma for the numerous stimulating discussions. We acknowledge financial support of the RFBR Grant No. 11-02-00741. . - ISSN 1557-1939РУБ Physics, Applied + Physics, Condensed Matter

Аннотация: We search for anomalous normal and superconductive behavior in the two-band Hubbard model with one narrow band. We analyze the influence of the electron–polaron effect and the Altshuler–Aronov effect on effective mass enhancement and scattering times of heavy and light components in the clean case. We find anomalous behavior of resistivity at high temperatures T>W∗hT > W_{h}^{*} both in 3D and 2D situations. The SC instability in the model is governed by an enhanced Kohn–Luttinger effect for p-wave pairing of heavy electrons via polarization of light electrons.

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Держатели документа:
[Kagan, M. Y.] PL Kapitza Inst Phys Problems, Moscow 119334, Russia
[Val'kov, V. V.] Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
P.L. Kapitza Institute for Physical Problems, Kosygina st. 2, 119334 Moscow, Russian Federation
Kirenskii Institute of Physics, Akademgorodok 50, Building 38, 660036 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; Каган, Максим Юрьевич

/ E. A. Mikhaleva [et al.] // J. Mater. Res. - 2013. - Vol. 28, Is. 24. - P. 3322-3331, DOI 10.1557/jmr.2013.360. - Cited References: 24. - This study was supported in parts by The Russian Foundation for Basic Research (Grant No. 12-02-31253-mol-a), Federal Special Program "Scientific and scientific-pedagogical staff of innovative Russia" (N 8379), and Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools (Grant NO. NSh-4828.2012.2). Dr. Maxim S. Molokeev is acknowledged for the x-ray characterization of the samples. . - ISSN 0884-2914. - ISSN 2044-5326РУБ Materials Science

Аннотация: Ceramic volumetric composites xLa(0.7)Pb(0.3)MnO(3)-(1-x)PbTiO3 (x = 0.18 and 0.85) were prepared. X-ray investigations have shown that rather low sintering temperature (800 degrees C) has allowed us to avoid the reaction and interdiffusion between two initial phases. Heat capacity, thermal expansion, and intensive magnetocaloric effect were measured in a wide temperature range. The sample composition has a low influence on temperatures of the ferromagnetic and ferroelectric phase transitions in composites. Electro- and barocaloric effects were determined by analysis in the framework of thermodynamic theory, electric equation of state, Maxwell relationships, and entropy-temperature-pressure phase diagram. Multicaloric efficiency of composites is discussed and compared with that of initial La0.7Pb0.3MnO3 and PbTiO3 compounds. Variation of a relationship between components can significantly increase both barocaloric and magnetocaloric efficiency of compositional material due to the mechanical stress appearing between grains of different ferroic phases under magnetic field.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660079, Russia

Доп.точки доступа:
Mikhaleva, E. A.; Михалева, Екатерина Андреевна; Flerov, I. N.; Флёров, Игорь Николаевич; Kartashev, A. V.; Карташев, Андрей Васильевич; Gorev, M. V.; Горев, Михаил Васильевич; Cherepakhin, A. V.; Черепахин, Александр Владимирович; Sablina, K. A.; Саблина, Клара Александровна; Mikhashenok, N. V.; Михашенок, Наталья Владимировна; Volkov, N. V.; Волков, Никита Валентинович; Shabanov, A. V.; Шабанов, Александр Васильевич; Russian Foundation for Basic Research [12-02-31253-mol-a]; Federal Special Program "Scientific and scientific-pedagogical staff of innovative Russia" [N 8379]; Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools [NSh-4828.2012.2]

/ P. O. Krasnov, N. S. Eliseeva, A. A. Kuzubov // J. Exp. Theor. Phys. - 2012. - Vol. 114, Is. 1. - P. 80-84, DOI 10.1134/S1063776111160059. - Cited References: 25. - We are grateful to the Joint Supercomputer Center, Russian Academy of Sciences, for the possibility of using the computer cluster for our quantum-chemical calculations. This work was supported by the Ministry of Education and Science of the Russian Federation (federal program "Human Capital for Science and Education in Innovative Russia" for 2009-2013). . - ISSN 1063-7761. - ISSN 1090-6509РУБ Physics, Multidisciplinary

Аннотация: The use of carbon nanotubes coated by atoms of transition metals to store molecular hydrogen is associated with the problem of the aggregation of these atoms, which leads to the formation of metal clusters. The quantum-chemical simulation of cluster models of the carbon surface of a graphene type with scandium and titanium atoms has been performed. It has been shown that the presence of five- and seven-membered rings, in addition to six-membered rings, in these structures makes it possible to strongly suppress the processes of the migration of metal atoms over the surface, preventing their clustering.

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Держатели документа:
[Krasnov, P. O.
Kuzubov, A. A.] Siberian State Technol Univ, Krasnoyarsk 660049, Russia
[Krasnov, P. O.
Kuzubov, A. A.] Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
[Eliseeva, N. S.
Kuzubov, A. A.] Siberian Fed Univ, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Eliseeva, N. S.; Kuzubov, A. A.; Кузубов, Александр Александрович; Краснов, Павел Олегович; Ministry of Education and Science of the Russian Federation

/ A. S. Krylov [et al.] // Cryst. Growth Des. - 2014. - Vol. 14, Is. 3. - P. 923-927, DOI 10.1021/cg4008894. - Cited References: 31. - The authors are grateful to Prof. I. N. Flerov for valuable support and useful discussions. The authors acknowledge stimulating discussions with Dr. S. N. Sofronova and Dr. A. S. Aleksandrovsky. The assistance of Dr. S. Skokov is sincerely appreciated. This work was partly supported by Russian Foundation for Basic Research project nos. 11-02-98002-r and 12-02-00056 and integration project SB RAS no. 28, SS-4828.2012.2 grant, and Federal Special Program "Scientific and scientific-pedagogical staff of innovative Russia" (no. 8379). . - ISSN 1528-7483. - ISSN 1528-7505РУБ Chemistry, Multidisciplinary + Crystallography + Materials Science, Multidisciplinary

Аннотация: The λ-shaped line width broadening anomalies of octahedron group vibrations in Rb2KMoO3F3 disordered crystal have been revealed in the wide temperature range by Raman technique. The line width of Mo-O and Mo-F vibrations in this crystal is connected with the lattice disorder. The dependence of ordering degree passing the phase transition point history has been discovered. Wide temperature-line width area is found below structural phase transition where different lattice disorder can be obtained at a given temperature by varying the rate of sample cooling. The current study demonstrates the ability of a dynamic temperature regime to control ordering processes in crystals. © 2014 American Chemical Society.

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Держатели документа:
SB RAS, LV Kirensky Inst Phys, Krasnoyarsk 660036, Russia
SB RAS, VS Sobolev Inst Geol & Mineral, Novosibirsk 630090, Russia

Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Kolesnikova, E. M.; Колесникова, Евгения Михайловна; Isaenko, L. I.; Krylova, S. N.; Крылова, Светлана Николаевна; Vtyurin, A. N.; Втюрин, Александр Николаевич; Russian Foundation for Basic Research [11-02-98002-r, 12-02-00056]; integration project SB RAS [28, SS-4828.2012.2]; Federal Special Program "Scientific and scientific-pedagogical staff of innovative Russia" [8379]

/ E. Altin [et al.] // J. Mater. Sci.-Mater. Electron. - 2014. - Vol. 25, Is. 3. - P. 1466-1473, DOI 10.1007/s10854-014-1753-1. - Cited References: 30 . - ISSN 0957-4522. - ISSN 1573-482XРУБ Engineering, Electrical & Electronic + Materials Science, Multidisciplinary + Physics, Applied + Physics, Condensed Matter

Аннотация: Eu–Ba–Cu–O composition was synthesized by solid state reaction technique. To determine optimum growth temperature, heat treatment was examined on the material at 880–1,100 °C. Microstructural evolution, phase formation and elemental distribution depending on heat treatments were examined by using X-ray diffraction, scanning electron microscope, energy dispersive X-ray spectroscope analysis. Optimum fabrication conditions were determined as 1,020 °C for 24 h under oxygen atmosphere and detailed characterization of corresponding compound was performed. The magnetization hysteresis loops are expounded to be the product of superconducting Eu-123 grains and magnetic Eu2+ ions. The peak effect on the magnetization curves was described by the extended critical state model. Scaling of the pinning force was found such that the peak position is proportional to the irreversibility field H irr and the maximum pinning force is proportional to H irr 2 .

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Держатели документа:
Inonu Univ, Bilimsel & Teknolojik Arastirma Merkezi, TR-44280 Malatya, Turkey
LV Kirensky Inst Phys SB RAS, Krasnoyarsk 660036, Russia
Inonu Univ, Fen Edebiyat Fak, Fizik Bolumu, Superiletkenlik Arastirma Grubu, TR-44280 Malatya, Turkey

Доп.точки доступа:
Altin, E.; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Demirel, S.; Oz, E.; Kurt, F.; Altin, S.; Yakinci, M.E.

/ V. V. Atuchin [et al.] // Mater. Chem. Phys. - 2014. - Vol. 147, Is. 3. - P. 1191-1194, DOI 10.1016/j.matchemphys.2014.07.003. - Cited References: 26. - This study is partly supported by the Ministry of Education and Science of the Russian Federation. . - ISSN 0254-0584. - ISSN 1879-3312РУБ Materials Science, Multidisciplinary

Аннотация: The Eu3+-doped red-orange emitting phosphor of tellurite glass 0.25Li2O–0.20Y2O3–0.5TeO2–0.05Eu2O3 has been synthesized by the melt quenching method. The amorphous nature of the glass has been verified by XRD measurements. The photoluminescence excitation and emission spectra, the luminescence decay curves have been investigated for the composition. The phosphor can be efficiently excited by the near UV light to realize the intense narrow red emission line (611 nm) corresponding to forced electric dipole transition 5D0 → 7F2 of Eu3+ ions. The Li2O–Y2O3–TeO2:Eu3+glass phosphor is a potential red-orange emitting candidate for the application in WLEDs.

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Держатели документа:
SB RAS, Inst Semicond Phys, Lab Opt Mat & Struct, Novosibirsk 630090, Russia
Tomsk State Univ, Funct Elect Lab, Tomsk 634050, Russia
Novosibirsk State Univ, Lab Semicond & Dielect Mat, Novosibirsk 630090, Russia
SB RAS, Inst Geol & Mineral, Lab High Pressure Minerals & Diamond Deposits, Novosibirsk 630090, Russia
Novosibirsk State Univ, Dept Appl Phys, Novosibirsk 630090, Russia
SB RAS, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Atuchin, V. V.; Yelisseyev, A. P.; Galashov, E. N.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Ministry of Education and Science of the Russian Federation

/ Z. Y. Wang [et al.] // Dalton Trans. - 2014. - Vol. 43, Is. 44. - P. 16800-16804, DOI 10.1039/c4dt02319f. - Cited References: 16. - The present work was supported by the National Natural Science Foundations of China (grant no. 51002146, no. 51272242), Natural Science Foundations of Beijing (2132050), the Program for New Century Excellent Talents in the University of the Ministry of Education of China (NCET-12-0950), Beijing Nova Program (Z131103000413047), Beijing Youth Excellent Talent Program (YETP0635) and the Funds of the State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University (KF201306). V.V.A. is partly supported by the Ministry of Education and Science of the Russian Federation. . - ISSN 1477-9226. - ISSN 1477-9234
   Перевод заглавия: Синее смещение излучения Eu2+ в твердых растворах (Ba,Sr)3Lu(PO4)3:Eu2 со структурой эулита, вызванное снятием напряжения, индуцированного соседними катионамиРУБ Chemistry, Inorganic & Nuclear

Аннотация: A series of iso-structural eulytite-type (Ba,Sr)(3)Lu(PO4)(3):Eu2+ solid-solution phosphors with different Sr/Ba ratios were synthesized by a solid-state reaction. Crystal structures of (Ba,Sr)(3)Lu(PO4)(3):Eu2+ were resolved by the Rietveld method, which shows an eulytite-type cubic Bi-4(SiO4)(3) structure with cations disordered in a single C-3 site while the oxygen atoms were distributed over two partially occupied sites. The emission peaks of Ba(3-x)SrxLu(PO4)(3):Eu2+ (0

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Держатели документа:
China Univ Geosci, Sch Mat Sci & Technol, Beijing 100083, Peoples R China
Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China
SB RAS, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia
SB RAS, Inst Semicond Phys, Lab Opt Mat & Struct, Novosibirsk 630090, Russia
Tomsk State Univ, Funct Elect Lab, Tomsk 634050, Russia
Novosibirsk State Univ, Lab Semicond & Dielect Mat, Novosibirsk 630090, Russia

Доп.точки доступа:
Wang, Z. Y.; Xia, Zhiguo; Molokeev, M. S.; Молокеев, Максим Сергеевич; Atuchin, V. V.; Атучин, Виктор Валерьевич; Liu, Q. L.

/ V. V. Atuchin [et al.] // Solid State Commun. - 2010. - Vol. 150, Is. 43-44. - P. 2085-2088, DOI 10.1016/j.ssc.2010.09.023. - Cited References: 34. - This study was partly supported by RFBR (Grant 09-02-00062) and SB RAS (Grant 34). . - ISSN 0038-1098РУБ Physics, Condensed Matter

Аннотация: The low-temperature ferroelectric G2 polymorph of K3WO3F3 oxyfluoride is formed by chemical synthesis. The electronic parameters of G2-K3WO3F3 have been measured by X-ray photoelectron spectroscopy under excitation with Al K alpha radiation (1486.6 eV). Detailed spectra have been recorded for all element core levels and Auger lines. The chemical bonding effects in the WO3 F-3 and WO6 octahedrons are considered by using the binding energy difference Delta BE(O-W) = BE(O 1s) BE(W 4f(7/2)). (C) 2010 Elsevier Ltd. All rights reserved.

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Держатели документа:
[Atuchin, V. V.] SB RAS, Inst Semicond Phys, Lab Opt Mat & Struct, Novosibirsk 630090, Russia
[Gavrilova, T. A.] SB RAS, Inst Semicond Phys, Lab Nanolithog & Nanodiagnost, Novosibirsk 630090, Russia
[Kesler, V. G.] SB RAS, Inst Semicond Phys, Lab Phys Principles Integrated Microelect, Novosibirsk 630090, Russia
[Molokeev, M. S.
Aleksandrov, K. S.] SB RAS, Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Atuchin, V. V.; Gavrilova, T. A.; Kesler, V. G.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Aleksandrov, K. S.; Александров, Кирилл Сергеевич

/ K. S. Aleksandrov // Kristallografiya. - 1993. - Vol. 38, Is. 1. - P. 128-139 ; Crystallogr. Rep. - Cited References: 38 . - ISSN 0023-4761

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Александров, Кирилл Сергеевич

/ S. G. Ovchinnikov [et al.] // J. Magn. Magn. Mater. - 2015. - Vol. 383. - P. 162-165, DOI 10.1016/j.jmmm.2014.11.083. - Cited References:20. - This work is supported by Siberian Branch of Russian Academy of Sciences (Projects no. 38), RFBR Grants nos. 13-02-00358, 13-02-00958, 13-02-01395, 14-02-31051, and 14-02-00186, and President of Russia Grant no. NSh-2886.2014.2. . - ISSN 0304РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter

Аннотация: The temperature dependence of the static magnetization of polycrystalline rare-earth cobaltites La1−xGdxCoO3−δ (x=0.2, 0.5, 1) was measured in a wide temperature range up to 900 K. The contribution from Co3+ ions at high temperatures to the magnetic susceptibility was obtained. The Birch–Murnaghan equation and the magnetic date were used to determine the spin gap Δ S as the difference between the energies of high-spin and low-spin states in these compounds.

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Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Orlov, Yu. S.; Орлов, Юрий Сергеевич; Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Vereschagin, S. N.; Perov, N. S.; Siberian Branch of Russian Academy of Sciences [38]; Moscow International Symposium on Magnetism(6 ; 2014 ; June-July ; Moscow)

/ N. Pachauri [et al.] // J. Appl. Phys. - 2015. - Vol. 117, Is. 23. - Ст. 233907, DOI 10.1063/1.4922778. - Cited References:32. - This work has been supported by NSF Grant No. ECCS-1102263. Tim Mewes and Behrouz Khodadadi would like to acknowledge support by the NSF-CAREER Award No. 0952929. R. Datta and B. Loukya sincerely acknowledge ICMS for providing advanced microscopy facility and funding. We thank Sahar Keshavarz, Archana Panikar, Stefan Kingler, and Jamileh Beik Mohammadi for help with the experimental work. . - ISSN 0021. - ISSN 1089-7550. - РУБ Physics, Applied

Аннотация: The effect of B-site cation ordering on the room temperature structural and ferromagnetic resonance (FMR) properties of single crystal spinel lithium ferrite (LiFe5O8, LFO) have been investigated. A detailed microstructural analysis is done through X-ray diffraction, polarized Raman spectroscopy, and transmission electron microscopy (TEM) to examine the effect of post-annealing on the B-site cation ordering. The X-ray diffraction pattern of the as-grown crystal indicates a disordered state of the crystal. However, the annealed sample shows additional superlattice reflections corresponding to the ordered phase. This ordering is further confirmed by Raman spectra and TEM images, which reveal ordering of Li and Fe ions at the octahedral sites contrasting with the relatively high degree of octahedral site disorder in the as-grown crystal. To study the effect of B-site ordering on the magnetic properties and FMR linewidth, vibrating sample magnetometry and broadband FMR measurements have been performed for both the ordered and disordered phases of lithium ferrite. The value of saturation magnetization for both phases is ∼290 emu/cm3. A single mode FMR profile is observed for both phases with little distortion. The linewidth characteristics of the ordered and disordered phases of lithium ferrite phases are compared, and it is observed that the linewidth is independent of the cation ordering. Both the phases exhibit a low linewidth (∼26 Oe at 30 GHz) and the effective damping parameter for the as-grown and annealed samples is determined to be 0.0021 ± 0.0001.
Влияние катионного упорядочения в Б-позициях при комнатной температуре на структурные свойства и ферромагнитный резонанс (ФМР) монокристалла литий железной шпинели (LiFe5O8, LFO) были исследованы. Подробный анализ микроструктуры делается с использованием рентгеновской дифракции, спектроскопии комбинационного рассеяния поляризованного света и просвечивающей электронной микроскопии (ПЭМ), чтобы изучить влияние после отжига на катионное упорядочение в B-позиции. Рентгеновская дифракционная картина, так выращенных кристаллов указывает на беспорядочное состояние кристалла. Тем не менее, пример показывает дополнительные индексы, соответствующие сверхрешетчатой упорядоченной фазы, при отжиге. Этот порядок подтверждается также спектрами комбинационного рассеяния и ТЕМ изображений, которые показывают порядок ионов Li и Fe в октаэдрических контрастными с относительно высокой степенью восьмигранной расстройства позиций в выращенных кристаллах. Для изучения влияния упорядочения В-позиций на магнитные свойства и ширины линии ФМР, вибрационные образцы магнитометрии и широкополосных ФМР измерений были выполнены как для упорядоченных и неупорядоченных фаз литиевого феррита. Значение намагниченности насыщения для обоих фаз ~290 emu / см3. Одиночный профиль в режиме ФМР наблюдается для обеих фаз с небольшим искажением. Ширина линии характеристики упорядоченной и неупорядоченной фаз литиевых ферритов сравниваются, и следует отметить, что ширина линии не зависит от катионного упорядочения. Оба фазы проявляют малую ширину линии (Э около 26 на 30 ГГц) и эффективный параметр демпфирования, как, для только выращенных, так и для отожженных образцов, определяется как 0,0021 ± 0,0001.

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Держатели документа:
Univ Alabama, Dept Phys & Astron, MINT Ctr, Tuscaloosa, AL 35487 USA.
Univ Alabama, Dept Chem, MINT Ctr, Tuscaloosa, AL 35487 USA.
Jawaharlal Nehru Ctr Adv Sci Res, Int Ctr Mat Sci, Bangalore 560064, Karnataka, India.
Univ Houston, Texas Ctr Superconduct, Houston, TX 77204 USA.
Univ Houston, Dept Phys, Houston, TX 77204 USA.
SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Pachauri, Neha; Khodadadi, B.; Althammer, M.; Singh, A.V.; Loukya, B.; Datta, R.; Iliev, M.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Gudim, I. A.; Гудим, Ирина Анатольевна; Mewes, T.; Gupta, A.; NSF [ECCS-1102263]; NSF-CAREER [0952929]; ICMS

/ P. P. Bobrov, V. L. Mironov, A. V. Repin // Russ. Geol. Geophys. - 2015. - Vol. 56, Is. 7. - P. 1065-1073, DOI 10.1016/j.rgg.2015.06.007. - Cited References: 21. - This work was supported by RFBR (grant nos. 12-05-00502a and 14-05-00151a). . - ISSN 1068-7971РУБ Geosciences, Multidisciplinary

Аннотация: Experimental measurements of the dielectric permittivity and equivalent conductivity of sandy-clayey samples (a mixture of river sand with bentonite or kaolin) saturated with salt-solution-diesel-fuel emulsions were performed in the frequency range from 10 kHz to 1 GHz at temperatures of 25-65 °C. It is shown that when the content of the salt solution in the saturating fluid does not exceed 10%, the dielectric permittivity in the frequency range from 1 MHz to 1 GHz depends little on the mineral composition of the sample and on the concentration of the saturating solution. When the portion of water is 33.3% or higher, increasing the concentration of the salt solution leads to an increase in the equivalent conductivity and the real part of the complex dielectric permittivity. Using the refractive model of the complex dielectric permittivity, we have estimated the dielectric properties of bound water, which depend on temperature and the type of clay (bentonite or kaolin) in the sand-clay mixture but are independent of the water saturation and the amount of clay in the sample.

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Держатели документа:
Omsk State Pedagogical University, Naberezhnaya im. Tukhachevskogo 14, Omsk, Russian Federation
L.V. Kirenskii Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Akademgorodok 50, str. 38, Krasnoyarsk, Russian Federation
M.F. Reshetnev Siberian State Aerospace University, pr. im. Gazety Krasnoyarskii Rabochii 31, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Mironov, V. L.; Миронов, Валерий Леонидович; Repin, A. V.; RFBR [12-05-00502a, 14-05-00151a]

/ M. Yin [et al.] // RSC Adv. - 2015. - Vol. 5, Is. 89. - P. 73077-73082, DOI 10.1039/c5ra12959a. - Cited References: 43. - The present work was supported by the National Natural Science Foundations of China (Grant No. 51472223), the Fundamental Research Funds for the Central Universities (Grant No. 2652015008), and New Century Excellent Talents in University of Ministry of Education of China (Grant No. NCET-12-0951). . - ISSN 2046-2069
   Перевод заглавия: Синтез, кристаллическая структура и люминесценция с апконверсией Gd2(WO4)3 содопированного Er3+, Yb3+РУБ Chemistry, Multidisciplinary

Аннотация: Up-conversion (UC) phosphors Gd2(WO4)3:Er3+/Yb3+ were synthesized by a high temperature solid-state reaction method. The crystal structure of Gd2(WO4)3:3% Er3+/10% Yb3+ was refined by Rietveld method and it was showed that Er3+/Yb3+ were successfully doped into the host lattice replacing Gd3+. Under 980 nm laser excitation, intense green and weak red emissions centered at around 532 nm, 553 nm, and 669 nm were observed, which were assigned to the Er3+ ion transitions of 4H11/2 → 4I15/2, 4S3/2 → 4I15/2 and 4F9/2 → 4I15/2, respectively. The optimum Er3+ doping concentration was determined as 3 mol% when the Yb3+ concentration was fixed at 10 mol%. The pump power study indicated that the energy transfer from Yb3+ to Er3+ in Er3+, Yb3+ co-doped Gd2(WO4)3 was a two-photon process, and the related UC mechanism of energy transfer was discussed in detail. This journal is © The Royal Society of Chemistry.

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Держатели документа:
School of Materials Science and Technology, Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, China University of GeosciencesBeijing, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, SB RAS, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Yin, Mengyan; Liu, Yangai; Mei, Lefu; Molokeev, M. S.; Молокеев, Максим Сергеевич; Huang, Zhaohui; Fang, Minghao

/ A. Antuzevics [et al.] // Phys. Scr. - 2015. - Vol. 90, Is. 11. - Ст. 115801, DOI 10.1088/0031-8949/90/11/115801. - Cited References: 32. - We are grateful to Professor S Ovchinnikov for providing ScFINF3/INF samples. This work was supported by L-KC-11-0005 project Nr.KC/2.1.2.1.1/10/01/006,5.3 . - ISSN 0031-8949
   Перевод заглавия: ЭПР исследование локальной структуры гадолиния в кристалле трехфтористого скандия с отрицательным коэффициентом теплового расширенияРУБ Physics, Multidisciplinary

Аннотация: Zero field splitting (ZFS) of Gd3+ impurity in ScF3 is studied by electron paramagnetic resonance at 77 and 295 K. ZFS parameter b4 values obtained from angular dependence simulations show that regardless of negative thermal expansion in ScF3 temperature dependence of |b4| is similar to other cubic fluoroperovskites. Our analysis of ZFS parameters indicates that the local structure of Gd3+ centres expands positively with temperature. © 2015 The Royal Swedish Academy of Sciences.

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Institute of Solid State Physics, University of Latvia, Kengaraga Str. 8, Riga, Latvia
L. V. Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Antuzevics, A.; Rogulis, U.; Fedotovs, A.; Berzins, D.; Voronov, V. N.; Воронов, Владимир Николаевич; Purans, J.

/ A. A. Dubrovskiy [et al.] // J. Appl. Phys. - 2015. - Vol. 118, Is. 21. - Ст. 213901, DOI 10.1063/1.4936838. - Cited References: 41. - We are grateful to Professor Yu. L. Raikher for useful discussions and M. A. Kazakova for the help in sample preparation. - This work was supported by Russian Federal Agency of Scientific Organizations (Project No. V.44.1.15) and scientific and educational center of energy-efficient catalysis of NSU . - ISSN 0021-8979РУБ Physics, Applied

Аннотация: We report the results of comparative analysis of magnetic properties of the systems based on ε-Fe2O3, nanoparticles with different average sizes (from ∼3 to 9 nm) and dispersions. The experimental data for nanoparticles higher than 6-8 nm in size are consistent with the available data, specifically, the transition to the magnetically ordered state occurs at a temperature of ∼500 K and the anomalies of magnetic properties observed in the range of 80-150 K correspond to the magnetic transition. At the same time, Mossbauer and ferromagnetic resonance spectroscopy data as well as the results of static magnetic measurements show that at room temperature all the investigated samples contain ε-Fe2O3 particles that exhibit the superparamagnetic behavior. It was established that the magnetic properties of nanoparticles significantly change with a decrease in their size to ∼6 nm. According to high-resolution electron microscopy and Mossbauer spectroscopy data, the particle structure can be attributed to the ε-modification of trivalent iron oxide; meanwhile, the temperature of the magnetic order onset in these particles is increased, the well-known magnetic transition in the range of 80-150 K does not occur, the crystallographic magnetic anisotropy constant is significantly reduced, and the surface magnetic anisotropy plays a decisive role. This is apparently due to redistribution of cations over crystallographic positions with decreasing particle size, which was established using Mössbauer spectra. As the particle size is decreased and the fraction of surface atoms is increased, the contribution of an additional magnetic subsystem formed in a shell of particles smaller than ∼4 nm becomes significant, which manifests itself in the static magnetic measurements as paramagnetic contribution. © 2015 AIP Publishing LLC.

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Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk, Russian Federation
International Laboratory of High Magnetic Fields and Low Temperatures, Wroclaw, Poland
Siberian Federal University, Krasnoyarsk, Russian Federation
Boreskov Institute of Catalysis, Novosibirsk, Russian Federation
Novosibirsk State University, Novosibirsk, Russian Federation

Доп.точки доступа:
Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Balaev, A. D.; Балаев, Александр Дмитриевич; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Bayukov, O. A.; Баюков, Олег Артемьевич; Pletnev, O. N.; Плетнев, Олег Николаевич; Yakushkin, S. S.; Bukhtiyarova, G. A.; Martyanov, O. N.
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/ M. Chen [et al.] // Inorg. Chem. - 2015. - Vol. 54, Is. 23. - P. 11369-11376, DOI 10.1021/acs.inorgchem.5b01955. - Cited References: 38. - The present work was supported by the National Natural Science Foundations of China (Grant Nos. 51572023, 51272242, and 51511130035), Natural Science Foundations of Beijing (2132050), the Program for New Century Excellent Talents in Univ. of Ministry of Education of China (NCET-12-0950), Beijing Nova Program (Z131103000413047), Beijing Youth Excellent Talent Program (YETP0635), and the Funds of the State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences (RERU2015022) . - ISSN 0020-1669
   Перевод заглавия: Структурный фазовый переход и люминесцентные свойства ортосиликата Ca2-xSrxSiO4:Ce3+РУБ Chemistry, Inorganic & Nuclear

Аннотация: The orthosilicate phosphors demonstrate great potential in the field of solid-state lighting, and the understanding of the structure-property relationships depending on their versatile polymorphs and chemical compositions is highly desirable. Here we report the structural phase transformation of Ca2-xSrxSiO4:Ce3+ phosphor by Sr2+ substituting for Ca2+ within 0 ≤ x 2. The crystal structures of Ca2-xSrxSiO4:Ce3+ are divided into two groups, namely, β phase (0 ≤ x 0.15) and α′ phase (0.18 ≤ x 2), and the phase transition (β → α′) mechanism originated from the controlled chemical compositions is revealed. Our findings verified that the phase transition Pnma (α′-phase) ↔ P21/n (β-phase) can be ascribed to the second-order type, and Sr2+ ions in Ca2-xSrxSiO4 preferentially occupy the seven-coordinated Ca2+ sites rather than the eight-coordinated sites with increasing Sr2+ content, which was reflected from the Rietveld refinements and further clarified through the difference of the Ca-O bond length in the two polymorphs of Ca2SiO4. The emission peaks of Ce3+ shift from 417 to 433 nm in the composition range of 0 ≤ x ≤ 0.8, and the difference in the decay curves can also verify the phase transformation process. Thermal quenching properties of selected Ca2-xSrxSiO4:Ce3+ samples were evaluated, and the results show that the integral emission intensities at 200 °C maintain 90% of that at room temperature suggesting superior properties for the application as white light-emitting diodes (w-LEDs) phosphors. © 2015 American Chemical Society.

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Держатели документа:
School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, SB RAS, Krasnoyarsk, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, Russian Federation

Доп.точки доступа:
Chen, M.; Xia, Z.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Liu, Q.
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